Gate for bridges.



J. L. HARRINGTON.

GATE FOR BRIDGES. APPLICATION FILED FEB. 23, 1912 Patented July 8, 1913.

u i a u v u J 4 i 4 a 4 u u a u a u a J v A TTOR/VEV WITNESSES:

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JOHN LYLE HARRINGTON,' OF KANSAS CITY, MISSOURI.

GATE FOR BRIDGES.

Specification of Letters Patent.

Patented July 8,1913.

Application filed February 23, 1912. Serial No. 679,356.

To all whom it may concern Be it known that I, JoiiN Lynn IIARRING- row,a citizen of the United States, residing at Kansas City, in the countyof Jackson and State of Missouri, have invented certain new and usefulImprovements in Gates for .lridges; and I do declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters and figures of reference marked thereon, which form a part ofthis specification.

My invention relates to gates, and more particularly to a gate forcontrolling the approaches to a lift bridge, or the like, and wherein itis desirable to control the oncoming and off-going sides of the roadwayindependently of each other, to facilitate travel; the principal objectof the invention being to provide a structure of this type which issimple and economical in construction and operation and comprises theimproved de tails of structure hereinafter described and illustrated inthe accompanying drawings, wherein Figure I is an end view of a bridgeapproach equipped with my improved gates, both the oil-coming andoff-going gates being shown in lowered position. Fig. II is a plan viewof a part of one of the gates, showing its connection and n'iounting ona bridge, and the arrangement of the individual motor. Fig. 111 is anenlarged detail view of one of the gate mountings, showing the spiralweb for turning the gate. Fig. 1V is an enlarged perspective view of oneof the guide plates carried by the gates.

Referring more in detail to the parts:- 9 designates the roadway, 10 apost and 11 the sidewalks of a bridge of any ordinary construction. Ateach side of the roadway is a standard 12 which runs to a sufficientheight to clear the highest loads which will probably pass over thebridge, and is circular in cross-section, being preferably constructedof metal tubing. Fixed to said standard are webs 13 which extendvertically to a height sufficient. to clear ordinary loads and are thenspiraled on the standard, as shown, the webs being arranged on oppositesides of the standard and paralleling each other during their st aightand spiraled length. The webs are preferably formed of bar metal andsecured to the standard by countersunk screws 14: which extend throughthe outer faces of the webs to provide smooth side faces therefor. Nearthe top of the webs the standard is provided with stop wings 15. On eachof said standards is a gate structure comprising a tubular drum 16 whichsurrounds the standard 12 and is of sufficient diameter to provide anannular space 17 between the same and the outer surfaces of the webs 13.At the upper end of the drum 16 is fixed a plate 18, having a circularopening 19 of but slightly greater diameter than the standard so that itwill fit snugly thereagainst, and having diametrically opposite slots 20for receiving the webs 13.

It is apparent, as will presently be more specifically described, thatwhen the gate is lifted the webs traveling in the slotted plate 18 willturn the gate when the spiral portions of the web are reached.

Fixed on drum 16 are the gate members 21 and 22, the former being longerthan the latter and adapted to cover substantially onehalf of theroadway of the bridge. The latter is adapted to cover the sidewalk andhas a weighted free end 22 to enable the short gate section to balancethe longer section. Each of the plates 18 has a slot 23 through whichthe upper end of a hanger bar 24: is projected, said hanger bar beingriveted to the gate and provided with an eye 25 at its upper end, withwhich cables 26 are connected. Cables 26 run up over the top of thestandard and around thegroove of a sheave wheel 27, the free ends ofsaid cables being connected with a counterweight 28, which substantiallybalances the weight of the gate. The shaft of sheave wheel 27 isconnected with an individual motor 29 whereby said wheel may be revolvedin either direction. to determine the upward or downward travel of thegate. A cross frame 30 connecting the posts 10 and a framework 31connects the standards 12 and frame 30 and supports the sheaves and.motors.

As before stated, an individual gate is arranged at each. corner of thebridge and adapted for ii'idividual operation as and for the purpose nowdescribed.

Presuming the gates to be assembled and in their elevated positions, sothat the road way is free for tra'llic in both directions, when theroadway is to be closed, the motors at the right-hand sides of theopposite ends of the bridge are operated so that the sheave wheels atsuch sides, or corners, of the bridge are revolved to tend to lift theoounterweights 28. As soon as the gate members are relieved of thecounterweights, the weight of said members allows them to lower on theirstandards, the webs 13 engaging the plates 18 so that the spiraledportions of the webs will tend to turn the gates on the standards tomove the long ends of the gates out over the roadway and the short endsover the sidewalks. It is apparent that by having the right-handsidewalks and sides of the roadway closed, the oil-coming traific isintercepted and as soon as the bridge and sidewalks have been cleared ofthe off-going trafiie the gates at the lefthand corners of the bridgeare lowered in like manner to entirely close the bridge.

Having thus described my invention, what I claim as new therein anddesire to secure by Letters-Patent is The combination with a standard,of a web fixed on the standard and having a straight lower portion andspiral upper por tion, and a gate having a slotted member slidablyengaging the web whereby the gate when raised is adapted to travel in adirect path over the lower portion of the web and in spiral path overthe upper portion thereof, for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN LYLE HARRINGTON.

lVitnesses LETA E. COATS, ARTHUR C. BROWN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

